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The KELT Follow-Up Network: Crowd-Sourced Photometry
Rob Siverd (LCOGT)Hotwired IV
Kilodegree Extremely Little Telescope Wide-field photometric survey for bright
transiting exoplanets (~15 discovered!) Coarse pixel scale (23 arcsec, defocused) Wide bandpass Amateur- and commercial-grade hardware Stable (but ugly) PSF Difference Imaging Pipeline (ISIS-based) Bright, high-value targets (8 < V < 10)
What is KELT?
Why 8 < V < 10?
KELT-North and KELT-South
Pepper, J., 2012, “The KELT-South Telescope”, PASP, 124, 230
Pepper, J., et al. 2007, "The Kilodegree Extremely Little Telescope (KELT): A Small Robotic Telescope for Large-Area Synoptic Surveys", PASP, 119, 923
Pipeline and reductions:Siverd, R. J., et al. 2012, “KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a Mid-F Star”, ApJ, 761, 123
Bandpass
Bandpass
~50,000 stars per field
1% error for V < 10
Performance
Observing Fields
KELT’s FOV
26°x26°
26°x26°
4.6’ x 4.6’
KELT-North
KELT’s FOV
26°x26°
4.6’ x 4.6’4.6’ x 4.6’
Faulkes Telescope NorthKELT-North
KELT’s FOV
26°x26°
4.6’ x 4.6’4.6’ x 4.6’
Faulkes Telescope NorthKELT-North
KELT’s FOV
Depth uncertainty due to blending/dilution (consequence of our DIA pipeline)
Source confusion (giant pixels) False positives due to imperfect calibration
and pointing issues (e.g., hot pixels)
Extra Photometry Required
~50 telescopes around the world Sites include backyards and pro
observatories Apertures from 0.3m (12”) to 2m Wide variety of filters available Amateurs, professionals, and educators Observations taken at leasure (or request) Results emailed to Google Group Key software contributions from
collaborators
Solution: Photometry Crowd
Solution: Photometry Crowd
Typical Results
Candidate Management (Google Docs)
Public version (exoplanets.org):http://astro.swarthmore.edu/transits.cgi
Public code:http://hven.swarthmore.edu/~jensen/tapir.htmlhttp://adsabs.harvard.edu/abs/2013ascl.soft06007Jhttps://github.com/elnjensen/Tapir
Candidate Dissemination: Tapir
Tapir Search Interface
Example Output: BOS
Fun! Scientific interest Authorship or coauthorship Learning new skills Challenging Bored of “pretty pictures” …
Motivation and Incentives